Significant advantages of using frequency converters in food packaging
The range of industries involved in packaging machinery is very wide. According to the application industry, it is divided into food computer automatic packing machine, pharmaceutical computer automatic packing machine, and other packaging machinery. Due to the wide range of applications of frequency converters, it will definitely feel like entering a paradise and suddenly enlightened after entering the market. Therefore, at the end of this article, only some other machines that use variable frequency speed regulation will be selected as a simple example for reference. The energy saving of frequency converter is mainly reflected in the application of fans and water pumps. The starting current of the motor using the inverter starts from zero and gradually increases, and the maximum value does not exceed the rated current, which reduces the impact on the power grid and the requirements for power supply capacity, thereby achieving the effect of energy saving, and prolonging the service life of the equipment. equipment maintenance costs. In fact, it is difficult to completely separate packaging machinery from pharmaceutical machinery. Therefore, packaging machinery is often divided into food packaging machinery and pharmaceutical packaging machinery. In fact, food computer automatic packing machine can also pack medicines, such as the granule packaging machine produced by Kenwei Company. , High-speed packaging can be performed for granulated coffee granules, and can also be packaged for granules of medicines such as cold granules. Due to the variety, it is difficult to list them all. However, this type of machinery has a common feature that most of the required specifications are below 3.7kw, some pharmaceutical machinery power is as large as 7.5kw, 5.5kw, while some centrifuges are as large as 15kw, 22kw, but need simple speed regulation Function. It is most suitable to use a frequency converter for speed regulation. With the improvement of the degree of automation, the operation, maintenance and daily maintenance of the packaging machine are more convenient and simple, which reduces the professional skills requirements of the operators. The quality of product packaging is directly related to the temperature system, the speed accuracy of the host, and the stability of the tracking system. The tracking system is the control core of the packaging machine. It adopts forward and reverse bidirectional tracking, which further improves the tracking accuracy. After the machine is running, the film marking sensor continuously detects the film marking (color mark), and at the same time, the tracking microswitch of the mechanical part detects the position of the machine. The above two signals are sent to the PLC. After the program operation, the output Y6 ( Positive and negative tracking) and Y12 (reverse tracking) control the positive and negative tracking of the tracking motor, find out the errors in the production process of packaging materials in time, and accurately compensate and correct them, avoiding the waste of packaging materials. If the inspection still fails to meet the technical requirements after tracking the predetermined number of times, it can automatically stop for inspection to avoid the generation of waste products; due to the use of frequency conversion speed regulation, the chain transmission is greatly reduced, the stability and reliability of the machine operation are improved, and the The noise of the machine running. It guarantees the high-tech level of the packaging machine with high efficiency, low loss, automatic detection and other multi-functional and fully automatic functions. Although the application function of the transmission system used in the food packaging machine is relatively simple, it has high requirements on the dynamic performance of the transmission, and the system requires fast dynamic follow-up performance and high speed stability accuracy. Therefore, the dynamic technical indicators of the inverter must be considered, and high-performance inverters can be selected to meet the requirements. In food machinery, the transmission system is widely used. For example, the cake must be fed by the conveyor belt before baking, and pass through the oven at a uniform speed according to the baking process. There are two conveying devices involved, namely, the feeding conveyor belt and the For the conveyor belt of the baking line, the speeds of the two must match, which can facilitate the same rise and fall. In the past, the speed regulation of such equipment basically used manual and mechanical step-by-step speed change (such as changing the size of the pulley or the gear box speed ratio, etc.), but now the use of frequency conversion speed regulation can greatly expand the speed regulation range, and can realize stepless regulation. speed. Similar filling production lines, powder raw material measuring and packaging lines, etc. will use variable frequency transmission systems. In the transmission system, the user can control the speed of the conveyor belt according to the size and material of the raw material to ensure uniform texture; at the same time, functions such as speed synchronization and fine-tuning can be realized according to the speed ratio requirements between different transmission systems. Since different working conditions require different speed sources to control the drive components of the transmission system, this requires the frequency converter to have more frequency sources and operating modes. For the food and beverage industry, productivity, flexibility and food safety will be is the main challenge.
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